单选题What is the purpose of a network mask?（）AIt is used to identify the maximum hop count of a subnetwork.BIt is used to identify an IP address as either private or public.CIt is used to identify the network to which an IP address belongs.DIt is used to identify the total number of bits present in an IP address.
单选题
What is the purpose of a network mask?（）
A
It is used to identify the maximum hop count of a subnetwork.
B
It is used to identify an IP address as either private or public.
C
It is used to identify the network to which an IP address belongs.
D
It is used to identify the total number of bits present in an IP address.
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